Electric-arc lamp.



No. 63|,649. Patented Aug. 22, |899; G. R. MACINTIRE.

ELECTRIC ARC LAMP. (No Model.) (Appucarian med Feb. 2s, 189s.) 2 sheets .sheet l.

AEmiiiin-"M ITIL@ Patented Aug. 22, |899. G. R. MAcINTIRE.

ELECTRIC ARC LAMP.

2 Sheets-Sheet 2.

(Application filed Feb. 28 1898.) (No Model.)

illu!!lnlllvrllft915.1494414 UNITED STATES 'PATENT OFFICE.

GEORGE R. MAClN'lIRE, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF 'lU ELLIOTT P. GLEASON, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 631,649, dated August 22, 1899.

Application led February 28, 189B. Serial No. 671,887. (No model.)

To aZZ whom t may concern.: make shadows. The upperor positive carbon Be itknown that I, GEORGE R. MACINTIRE, G is supported by the holder Il within the a citizen of the United States, residing in the sleeve E and the central aperture of the socity and county of New York, in the State of lenoid B. The said holder ll is preferablya 55 5 New York, have invented certain new and metallic tube adapted to move up and down useful Improvements in Electric-Arc Lamps, to a limited extent within the sleeve E and of which the following is a specification, refthe solenoid B, being guided in its movements erence being had to the accompanying drawand held from electrical contact with the ings, forming a part thereof. shell A, the solenoid B, and the sleeve E, as 6c Io The objects of this invention are to simplify clearly shown in Figs. 4 and 5, by a short inthe construction of electric-arc lamps, to resulated sleeve aat the upper end of the shell duce to a minimum the size of such lamps, to A and by a short sleeve or ring e' of insulatimprove their practical operation, to obviate ing material seated in the lower end of the as far as possible the danger of the formation sleeve E. At all intermediate points the 6 5 15 of the arcs between their working parts, and holder H is freefrom the shell, solenoid, and. to arrange their working parts and electrical sleeve. The upper carbon G receives current connections in such a manner as to diminish through the tubular holder H and may rest the danger in handling them while the curin immediate contact therewith, or longitudirent is on. To the end that these various obnal wires lz h may be provided within the 7o zo jects may be attained, I have devised the holder H, as clearly represented iu Fig. 5, to several novel features of construction and armaintain proper electrical contact with the rangement which I have described and eX- carbon without holding itvso tightly as to inplained hereinafter with reference to the con-v terfere with its free movement under the opvenient and practical embodiments 'thereof eration ofthe feeding devices. 75 2 5 illustrated in the accompanying drawings, in For the purpose of depriving the upper car- Whichbon of current when it has been consumed Figure lis a View in elevation of a complete until but a short portion remains and of prelamp in which my improvements are emventing at the same time'the hot stub of carbodied, the outer globe being shown partly in bon from falling into and perhaps cracking 8o 3o section. Fig. 2is a horizontal section on the the globe f when it has passed beyond the plane indicated by the line of Fig. 1. Fig. grip of the feeding devices a sleeve 7L of in* 3 is a horizontal section on the plane indicated sulatin g material is secu red within the lower bythe line y y. Fig. et is a vertical central end of theholder II, so that it centers the section ofthe lamp shown in Fig. l. Fig. 5 stub of the upper carbon upon the lower ear- 85 35 is a sectional detail view, on a larger scale, of bon and at the same time holds it out of conthe upper-carbon holder and some of its astact with the conducting-surface. sociated parts. Fig. (5 is adetail view in ver- The holder' 1I has secured to itself at its tical central section of the upper portion of upper portion the sleeve Il', which constitutes the lamp, showing a slight modification to be the core of the solenoid, the said sleeve ll 9o 4o referred to. being free from contact with the spool ot' the In the construction representedin the drawsolenoid andwith the frame of the lamp. ings, a shell A, adapted for suspension from At a convenient distance above the inner any suitable support, incloses a solenoid B globe F the sleeve E is slotted, as at e2, to perand supportsaholder C for an outer protectmit of the attachment to the holder II by 45 ive globe D. From the shell A depends a means of insulated studs z' (I of a clutch-carsleeve E, to which is secured, by a suitable rier I. TheI latter has one or more cups 1", bayonet or other joint e, the inner small globe which taper slightly inward and downward F, immediately inelosing the arc. The lower to receive a corresponding number of clutchor negative carbon Gr is supported wholly by pieces J J, which are preferably formed as :on 5o the globe F, so that there are no arms in the rollers or balls and are made of some insupalh of the light to obstruct the same and to latingmaterial, such aslava, the clutch-pieces being held from escaping suitable clips i2. The said clutch-pieces are intended to bear directly upon the upper carbon, and for this purpose the sleeve E and the holder Il are slotted longitudinally, as at e3 and 7l?, respectively, the said slots registering one with another. It will be obvious that when the holder ll moves upward under the influence of thc solenoid B upon the core Il it will carry with it the carbon through the cooperation of the tapering cups i and the clutch-pieces J, while at the same time owing to the nature of the material of which said clutch -pieccs are formed there-can be no short-circuiting between the upper carbon and the other parts of the lamp. When the holder Il descends, the said clutch-pieces will be checked by contact with the lower ends of the slots e3 in the sleeve E before the holder reaches the extreme limit of its downward movement, and the upper carbon will therefore be released from the grip of the clutch and be permitted to descend to compensate for the reduction in length of said carbon by the consumption thereof at thc lower end. In this manner the extremity ot' the upper carbon will be kept always at the proper diS- tance from the extremity of the lower carbon i'or the formation ofthe arc.

The positive wire is brought to a suitable bindil'lg-post K on the shell A, from which connection is made to the coils of the solenoid B and thence to a second binding-post K on the shell A. From said post K' a flexible connection K2 is made to a stud h3, which projects from the holder Il through an elongated slot a' in the tubular extension a2 of the shell A. Thence the path of the current is by the upper and lower carbons and the wire K3 to a binding-post K4, to which the negative wire may be connected.

It will be observed that in the construction shown in Fig. 4: the cap of the holder H and the sleeve or cup a, within which it moves, form a dash-pot to retard the movement of the holder under the influence of the solenoid.

In the construction shown in Fig. 6 the sleeve-core H2 is provided with a packingsleeve r to iit closely within the bore of the spool of the solenoid, and the tubular extension a3 of the shell A is extended downward to make a tight joint with the spool of the solenoid, whereby also a dash-pot is formed. The packing-sleeve 7L obviously should be of some suitable insulating material. In the construction shown in said Fig. 6 also the upper carbon G' is represented as having a cap g, which is provided with spring-fingers g for the purpose ot' making contact with the conducting-holder II. Furthermore, this cap is of such diameter that it cannot pass the clutch J, wherefore as it holds the carbon frictionally the stub of the carbon will be suspended out of contact with the lower carbon when it has been consumed as far as possible. It is obvious that this device may be employed in the construction shown in Fig.

from the cups by` 4 in addition to the insulating-sleeve, if desired. As represented in Fig. 4, the cap to which the globe F is attached is provided with holes c4, which are covered by a loose annular washer c", having a lining c of asbestos or other like material, whereby the globe may be relieved of any excess of pressure of gases developed by the arc and the globe ventilated as much as necessary, while at the same time the globe is protected against the too free entrance of air.

The mode of operation of my improved lamp will be readily understood from thc foregoing description of the construction and arrangement ot vits parts without further explanation herein.v It will be evident also that the lamp is not only compact, but is of extremely simple construction and is free from liability to short-eircuiting, whereby its operation is rendered much more certain and uniform and there is practically no liability to derangement.

I claim as my invention` l. In an electric-arc lamp, the combination with a frame or shell and a solenoid supported thereby, of a conducting carbon-holder insulated from the frame or shell, a connection from the solenoid to the holder electrically independent of the frame or shell, means for maintaining contact between the carbon and the holder, a core for said solenoid secured to said holder, a clutch-carrier secured to said holder, and a clutch-piece of insulating material mounted in said carrier to make eontact with the carbon in said holder, substantially as shown and described.

2. In an electric-arc lamp, the combination with a frame or shell and a solenoid supported thereby, of a conducting carbon-holder insulated from the frame or shell, a connection from the solenoid to the holder electrically independent of the frame or shell, means for maintaining contact between the carbon and the holder, a core for said solenoid secured to said holder, a clutch-carrier secured to said holderand havingataperingcup,andaclutchroller of insulating material mounted in said carrier to make contact with the carbon in saidl holder, substantially as shown and described.

3. In an electric-arc lamp, with a frame or shell having a depending sleeve and a solenoid supported by said frame or shell, of a tubular carbon-holder insulated from the frame or shell, a connection from the solenoidto the holder electricallyY independent of the frame or shell, means for maintaining contact between the carbon and the holder, a core for said solenoid secured to said holder, a clutch-carrier secured to said holder through slots in said sleeve and a clutch-piece of insulating material mounted in said carrier to make contact with the carbon in said holder through registering slots in said sleeve and holder, substantially as shown and described.

4. In an electric-arc lamp, the combination with a frame or shell having a depending IOO the combination sleeve, anda solenoid supported by said frame or shell, of a tubular carbon -holder of conducting materi l, means for maintaining contact between the carbon and the holder, insulated guiding devices to keep said holder out of contact with said frame or shell and sleeve, a corefor said solenoid secured to said holder, a connection from the solenoid to said holder electrically independent of theframe or shell, a clutch-carrier secured to said holder, and a clutch-piece of insulating material mounted in said carrier to make contact with the carbon in said holder, substantially as shown and described.

5. In an electric-arc lamp, the combination .with a frame or shell and means to support a lower carbon therefrom, of a conducting- `holder for the upper carbon, feeding devices for said upper carbon and a sleeve of insulating material within said holder and below said feeding devices to center the stub of the upper carbon upon the lower carbon and t deprive it of current, substantially as shown and described.

6. In an electric-arc lamp, the combination with a frame or shell', and a solenoid supported by said frameor shell, of a conducting carbonlholder, a core for said solenoid secured to said holder, feeding devices c'arried by said holder and a exible, electrical connection to said holder through a slot in said shell, substanA tia'lly as shown and described.

7 In an electric lamp, the combination with a frame or shell, and a solenoid supported thereby, of a carbon-holder electrically connected with the solenoid independent of said frame or shell, a core for the solenoid secured to said holder within the spool of the solenoid and having a packing-sleeve of insulating material in contact with the` spool to form, in connection therewith, a dash-pot, and also serving to insulate the core and holder from the frame or shell, and means to close the bore of the spool above the shell; substantially as described.

This specification signed and witnessed this 26th day of February, A. D. 1898.

GEORGE R. MACINTIRE.

In presence of W. B. GREELEY, A. N. JESBERA. 

